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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a30608ceeaf622d995ff923e74ccf7a93b7a20e347dc99100dc6e5cb527b62e' 
  AND token = 'dMutSnLbbJ5tD/ml2e4/2E11d+R7/ykT5JLq7IMjBeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}